Temperamental Mail, keeps crashing.

Hi, I am using Leopard version 10.5.5 on a Mac Pro and Mail keeps crashing when trying to sync accounts.

I have two MobileMe accounts that sync with the account, and it always crashes while doing a search for new mail.

It was working fine this morning, I then turned my computer off to go to work, the only difference now is that I started my computer up with my iPhone connected. At first I thought that may have been the problem, so I restarted without it.

Now for the actual question; If I can't resolve it, does anyone think that deleting the Preferences file will fix it?

I don't particularly want to reformat because I only did that about a month ago.

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